To accurately respond to your question regarding the U.S. foreign policy illustrated in the cartoon, it would require context about the specific cartoon itself. However, based on what is commonly associated with U.S. foreign policy during certain historical contexts (e.g., the Monroe Doctrine), the most likely intention would be:
prevent further European colonization in the Western Hemisphere.
If you could provide more details about the cartoon or the specific historical context it represents, I may be able to give a more definitive answer.